A proposal to solve some puzzles in semileptonic B decays

Abstract

Some long-standing problems in the experimental data for semileptonic b -> c l nu decay rates have resisted attempts to resolve them, despite substantial efforts. We summarize the issues, and propose a possible resolution, which may alleviate several of these tensions simultaneously, including the "1/2 vs. 3/2 puzzle" and the composition of the inclusive decay rate in terms of exclusive channels.

5 pages, 4 figures

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• Observation of new resonances decaying to $D\pi$ and $D^{\ast }\pi$ in inclusive $e^{+}{e}^{-}$ collisions near $\sqrt{s}=$10.58 GeV
• $B\to D^{(\ast )}$ Form Factors from QCD Light-Cone Sum Rules
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• Brief review on semileptonic B decays
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• The semileptonic decays of $B/B_s$ meson in the perturbative QCD approach: A short review
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